The role of eating sweet potatoes: 1, can assist in lowering blood sugar, because sweet potatoes are rich in dietary fiber, can slow down the absorption and metabolism of carbohydrates is sugar, for high blood sugar or diabetes, appropriate to eat sweet potatoes have a very good role in controlling blood sugar. 2, can reduce the incidence of overweight and obesity, because sweet potatoes after eating a significant sense of satiety, and thus can avoid the intake of other excessive food. 3, can laxative, because the dietary fiber in sweet potatoes can mechanically stimulate intestinal peristalsis, the role in the prevention of constipation is very obvious.